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Статті в журналах з теми "Cylindrical pipe":
1
JG, Abuga. "Mathematical Modelling and Simulation of Aluminium Filling in Conical Pipe and Cylindrical Pipe under High Pressure." Physical Science & Biophysics Journal 6, no. 2 (July 5, 2022): 1–7. http://dx.doi.org/10.23880/psbj-16000215.
Анотація:
The desired technology for manufacturing light-weight components from metal alloys mostly aluminum and magnesium alloy is Die casting. High pressure die casting requires the liquid metal to be forced at high speed and pressure through a metal pipe. In our study, we seek to study Aluminum filling under high pressure in two different pipes, cylindrical and conical pipes. Two cases are considered for the cylindrical pipe, when the pipe vertical and when the pipe in inclined at an angle of 450 with the horizontal. The governing equations are obtained and the results are compared. The governing equations are obtained and modeling is done using ANSYS FLUENT. The results show that inclining the cylindrical pipe causes a shift in the oscillations and the inclined pipe has slightly lower amplitude of oscillation implying a greater loss of energy due to the inclination. The inclined cylindrical pipe has higher damping compared to the vertical cylindrical pipe. It is also evident that the conical pipe has higher oscillations than the cylindrical pipe implying a greater loss of energy for the conical cylindrical.
2
Adachi, T., S. Ujihashi, and H. Matsumoto. "Impulsive Responses of a Circular Cylindrical Shell Subjected to Waterhammer Waves." Journal of Pressure Vessel Technology 113, no. 4 (November 1, 1991): 517–23. http://dx.doi.org/10.1115/1.2928789.
Анотація:
The impulsive responses of semi-finite and finite pipes filled with fluid are analyzed in order to clarify the validity of Joukowsky’s theory and the fluid-pipe coupling effect. In the analysis, Flu¨gge’s dynamic bending shell theory and the potential theory of compressible perfect fluid are used. The analytical solutions in Laplace transformed domain are obtained. The inversion of the solutions is performed numerically using the algorithm of FFT. When a pipe is fairly long, it is shown that the result of Joukowsky’s theory which has no pipe inertia effect approximately agrees with that of the coupled theory. When a pipe is short, Joukowsky’s theory shows rough approximation of the responses. The response of the uncoupled theory with the inertia of a pipe is different from that of the coupled theory for both long and short pipes.
3
Afandiyev, Emin Musa, and Mahammadali Nuraddin Nuriyev. "ANALYSIS OF THE CONDITION OF A PIPE FIXED IN A CLAMPING DEVICE." EUREKA: Physics and Engineering, no. 1 (January 29, 2021): 78–85. http://dx.doi.org/10.21303/2461-4262.2021.001587.
Анотація:
Due to the fact that clamping devices are widely used in various industries, the requirements for the operation of such devices are constantly increasing. This is due to an increase in the general requirements for processing accuracy, as well as an increase in the forces acting on the clamped part. The reliability of these devices when working with thin-walled cylindrical parts is of great importance.
Thin-walled cylinders used in mechanical engineering are subject to significant loads. With prolonged exposure to loads from clamping forces, as well as from axial tensile forces, plastic deformations of cylindrical parts occur. In the oil and gas industry, when clamping drill and casing pipes in some areas in the capture zone, stresses exceed the yield strength. Multiple clamping of the pipe will reduce the pipe wall in the gripping area, which causes premature pipe failure. Therefore, increasing the holding capacity of clamping mechanisms is relevant.
Analysis of broken drill pipes, which have been operating in wedge grips for a long time, showed that in most cases the pipes undergo plastic deformation caused by damage to the pipe surface by the teeth of the ram. To clarify the actual conditions of loading the pipe and the possibilities of increasing the capacity of the clamping devices, studies of the contact pressures in the clamping zone were carried out.
A new pipe clamping chuck is also presented, which provides a sufficiently high reliability of fastening of cylindrical parts.
4
Idrus, Fairosidi, Nazri Mohamad, Ramlan Zailani, Wisnoe Wirachman, and Mohd Zulkifly Abdullah. "Experimental Model to Optimize the Design of Cylindrical Heat Pipes for Solar Collector Application." Applied Mechanics and Materials 393 (September 2013): 735–40. http://dx.doi.org/10.4028/www.scientific.net/amm.393.735.
Анотація:
A heat pipe is a heat-transfer device that use the principles of thermal conductivity and phase change to transfer heat between two ends at almost constant temperature. The thermal peformance of cylindrical heat pipes depends on design parameters such as dimensions of the heat pipe, material, wick structure and the working fluid. An experimental strategy was designed to study the effect of these parameters on the thermal performance of cylindrical heat pipes. The experimental design was conceived by employing the Taguchi method. The final aim of the experiments is to come up with design parameters that will yield optimum thermal performance. This paper presents an efficient design of experiment and the associated experimental setup and procedures to be carried out in order to optimize the design of cylindrical heat pipes.
5
Fukuda, Izumi, Yasunori Harada, and Yuichi Tanaka. "Effect of Temperature on Plastic Buckling Strength of Shot Peened Pipe of Magnesium Alloys." Materials Science Forum 654-656 (June 2010): 747–50. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.747.
Анотація:
This paper deals with the effect of temperature on plastic buckling strength of cylindrical pipe of some magnesium alloys subjected to shot peening process. Workpieces are three cylindrical pipes of AZ31, AZ61 and AZ80 magnesium alloys. The shape of pipe is 30mm in height, 16mm and 14mm in outer and inner diameters. The shot peening treatment was given on the surface of cylindrical pipe using an air-type peening machine. Plastic buckling strength test was performed under axial compression in a case of both ends with fixed condition, at several temperatures between 293K and 573K and at a crosshead speed of 1 mm/min using an Instron-type testing machine. From the experimental result, buckling stresses for all kinds of AZ31, AZ61 and AZ80 alloy pipe were strengthened after the shot peening treatment, but a few of differences for the increasing ratio. The buckling stress of the shot-peened pipe was kept higher than that of as received one up to the test temperature of 473K, however it tended to be around equal at 573K.
6
Doi, Taiga, Takashi Futatsugi, Michio Murase, Kosuke Hayashi, Shigeo Hosokawa, and Akio Tomiyama. "Countercurrent Flow Limitation at the Junction between the Surge Line and the Pressurizer of a PWR." Science and Technology of Nuclear Installations 2012 (2012): 1–10. http://dx.doi.org/10.1155/2012/754724.
Анотація:
An experimental study on countercurrent flow limitation (CCFL) in vertical pipes is carried out. Effects of upper tank geometry and water levels in the upper and lower tanks on CCFL characteristics are investigated for air-water two-phase flows at room temperature and atmospheric pressure. The following conclusions are obtained: (1) CCFL characteristics for different pipe diameters are well correlated using the Kutateladze number if the tank geometry and the water levels are the same; (2) CCFL occurs at the junction between the pipe and the upper tank both for the rectangular and cylindrical tanks, and CCFL with the cylindrical tank occurs not only at the junction but also inside the pipe at high gas flow rates and small pipe diameters; (3) the flow rate of water entering into the vertical pipe at the junction to the rectangular upper tank is lower than that to the cylindrical tank because of the presence of low frequency first-mode sloshing in the rectangular tank; (4) increases in the water level in the upper tank and in the air volume in the lower tank increase water penetration into the pipe, and therefore, they mitigate the flow limitation.
7
Zinurov, V. E., A. V. Dmitriev, M. A. Ruzanova, and O. S. Dmitrieva. "Classification of bulk material from the gas flow in a device with coaxially arranged pipes." E3S Web of Conferences 193 (2020): 01056. http://dx.doi.org/10.1051/e3sconf/202019301056.
Анотація:
The paper deals with the problem of classification of bulk material, based on silica gel, larger than 30 µm, from dusty gas flow. In order to solve this problem, the design of a classifier with coaxially arranged pipes is proposed. According to the conducted studies, it is more efficient to use a classifier with an inner conical pipe to solve the problems of separating the particles from the gas flows of various sizes, since a greater value is achieved for the centrifugal, inertial, gravitational and other forces acting on the dusty flow, that contribute to knocking the particles out of its structure, than in a classifier with a cylindrical inner pipe. On average, the efficiency of a classifier with a conical inner pipe is by 35.3% higher than that of a classifier with a cylindrical inner pipe. Classification of particles of bulk material, based on silica gel, larger than 30 µm from the dusty gas flows is solved most effectively by using a classifier with a conical inner pipe and hd parameter of 50 mm and a classifier with a cylindrical inner pipe and hd parameter of –10 mm.
8
JG, Abuga. "Analysis of Aluminium Filling in Cylindrical Pipe under High Pressure by Experiment and Mathematical Modelling." Physical Science & Biophysics Journal 7, no. 1 (January 5, 2023): 1–9. http://dx.doi.org/10.23880/psbj-16000236.
Анотація:
The preferred method for producing lightweight metal components, mainly from aluminum and magnesium alloys, is through high pressure die casting. This process involves rapidly and forcibly injecting liquid metal into a metal mold under high pressure. Our study aims to compare results obtained from the numerical modelling of the filling of aluminum under high pressure with the experimental results. Two different cylindrical pipes are used. The results indicate for imposed values of KE = 14 and KW = 60 for pipe 1(Dentry/Drp=40/40) and pipe 2 (Dentry/Drp=16/40) respectively, the mathematical model with the same initial conditions gives some results which are close to the experimental data. The results also indicate that pipe 2 is damped faster than pipe and this is due to the singular pressure loss at the entry.
9
Kim, Jae-Hee, Jae-Cheol Lee, and You-Rack Choi. "PiROB: Vision-based pipe-climbing robot for spray-pipe inspection in nuclear plants." International Journal of Advanced Robotic Systems 15, no. 6 (November 1, 2018): 172988141881797. http://dx.doi.org/10.1177/1729881418817974.
Анотація:
Among many pipes in a nuclear power plant, the spray pipes in the reactor building are one of the most important pipes in view of their function and safety aspects. However, it is very difficult to manually reach and inspect the pipes for defects or damage, because these pipes are installed in very high places. To carry out this kind of inspection more easily, we developed a mobile robot to climb up and down and to cross over such pipes. A mobile robot should be small and light enough that it can be practically and safely operated in a nuclear power plant. Our robot is able to overcome obstacles such as valves, pipe flanges, and T-shaped branches, and it also meets the requirements of fail-safe, autonomous grasping, and self-power without the cables to the remote control station. The robot has a five-degree-of-freedom manipulator and two grippers and moves along the cylindrical pipes bypassing the obstacles. The robot should be able to grasp the next pipe autonomously, because the robot works in places high off the ground where the remote operator cannot see the next pipe for the robot to grasp. This article proposes a vision-based scheme for grasping a cylindrical pipe semi-autonomously and describes its solution along with the forward kinematics and inverse kinematics of the mobile robot. The configuration of the pipe-climbing robot, including its hardware and software, is described, and the robot control with visual grasping is explained. The robot can be used practically for spray-pipe inspection as well as many potential other applications, such as inspection of the roof frame of a stadium consisting of pipes.
10
Li, Bing, Yu Lan Wei, Dan Zhang, and Qing Huang. "Influence of Lumped Mass on the Natural Frequency of Cylindrical Pipe." Advanced Materials Research 532-533 (June 2012): 403–7. http://dx.doi.org/10.4028/www.scientific.net/amr.532-533.403.
Анотація:
The lumped mass on the cylindrical pipe affects the natural frequency of the cylindrical pipe. The first-three order natural frequencies and vibration modes of the cylindrical pipe with different lumped masses are analyzed by the bending vibration theory and finite element analysis, respectively. The results with different lumped masses are obtained by experiments. As shown in the results, the natural frequencies of the cylindrical pipe with lumped mass are lower than those without lumped mass. The greater the lumped mass is, the smaller the natural frequencies of the pipe are.
Дисертації з теми "Cylindrical pipe":
1
Tribbe, Christian. "Gas/liquid flow in cylindrical and corrugated channels." Thesis, University of Surrey, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.244760.
2
Ozcakir, Ozge. "Vortex-Wave Solutions of Navier-Stokes Equations in a Cylindrical Pipe." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1388682148.
3
Basco, Scott William. "One Dimensional Approach to Modeling Damage Evolution of Galvanic Corrosion in Cylindrical Systems." University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1367489568.
4
Komminaho, Jukka. "Direct numerical simulation of turbulent flow in plane and cylindrical geometries." Doctoral thesis, Stockholm, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3054.
5
Ghanbarpourgeravi, Morteza. "Investigation of Thermal Performance of Cylindrical Heatpipes Operated with Nanofluids." Doctoral thesis, KTH, Skolan för industriell teknik och management (ITM), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-202566.
Анотація:
Nanofluids as an innovative class of heat transfer fluids created by dispersing nanometre-sizedmetallic or non-metallic particles in conventional heat transfer fluids displayed the potential toimprove the thermophysical properties of the heat transfer fluids. The main purpose of this study is toinvestigate the influence of the use of nanofluids on two-phase heat transfer, particularly on thethermal performance of the heat pipes. In the first stage, the properties of the nanofluids were studied,then, these nanofluids were used as the working fluids of the heat pipes. The thermal performance ofthe heat pipes when using different nanofluids was investigated under different operating conditionsexperimentally and analytically. The influences of the concentration of the nanofluids, inclinationangles and heat loads on the thermal performance and maximum heat flux of the heat pipes wereinvestigated.This study shows that the thermal performance of the heat pipes depends not only on thermophysicalproperties of the nanofluids but also on the characteristics of the wick structure through forming aporous coated layer on the heated surface. Forming the porous layer on the surface of the wick at theevaporator section increases the wettability and capillarity and also the heat transfer area at theevaporator of the heat pipes.The thermal performance of the heat pipes increases with increasing particle concentration in all cases,except for the heat pipe using 10 wt.% water/Al2O3 nanofluid. For the inclined heat pipe, irrespectiveof the type of the fluid used as the working fluid, the thermal resistance of the inclined heat pipes waslower than that of the heat pipes in a horizontal state, and the best performance was observed at theinclination angle of 60o, which is in agreement with the results reported in the literature. Otheradvantages of the use of nanofluids as the working fluids of the heat pipes which were investigated inthis study were the increase of the maximum heat flux and also the reduction of the entropy generationof the heat pipes when using a nanofluid.These findings revealed the potential for nanofluids to be used instead of conventional fluids as theworking fluid of the heat pipes, but the commercialization of the heat pipes using nanofluids for largescale industrial applications is still a challenging question, as there are many parameters related to thenanofluids which are not well understood.QC 20170228
6
McVicker, William Richard. "An analytical approach to open, cylindrical organ-pipe scaling from a historical perspective with specific reference to the scaling practices of selected organ-builders." Thesis, Durham University, 1987. http://etheses.dur.ac.uk/1551/.
7
Salahifar, Raydin. "Analysis of Pipeline Systems Under Harmonic Forces." Thesis, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/19820.
Анотація:
Starting with tensor calculus and the variational form of the Hamiltonian functional, a generalized theory is formulated for doubly curved thin shells. The formulation avoids geometric approximations commonly adopted in other formulations. The theory is then specialized for cylindrical and toroidal shells as special cases, both of interest in the modeling of straight and elbow segments of pipeline systems. Since the treatment avoids geometric approximations, the cylindrical shell theory is believed to be more accurate than others reported in the literature. By adopting a set of consistent geometric approximations, the present theory is shown to revert to the well known Flugge shell theory. Another set of consistent geometric approximations is shown to lead to the Donnell-Mushtari-Vlasov (DMV) theory. A general closed form solution of the theory is developed for cylinders under general harmonic loads. The solution is then used to formulate a family of exact shape functions which are subsequently used to formulate a super-convergent finite element. The formulation efficiently and accurately captures ovalization, warping, radial expansion, and other shell behavioural modes under general static or harmonic forces either in-phase or out-of-phase. Comparisons with shell solutions available in Abaqus demonstrate the validity of the formulation and the accuracy of its predictions. The generalized thin shell theory is then specialized for toroidal shells. Consistent sets of approximations lead to three simplified theories for toroidal shells. The first set of approximations has lead to a theory comparable to that of Sanders while the second set of approximation has lead to a theory nearly identical to the DMV theory for toroidal shells. A closed form solution is then obtained for the governing equation. Exact shape functions are then developed and subsequently used to formulate a finite element. Comparisons with Abaqus solutions show the validity of the formulation for short elbow segments under a variety of loading conditions. Because of their efficiency, the finite elements developed are particularly suited for the analysis of long pipeline systems.
8
Charles, Antoine Henri Etienne. "Étude thermo-rhéologique de boues digérées : application à l’écoulement en conduite dans les procédés de méthanisation." Electronic Thesis or Diss., Ecole nationale supérieure Mines-Télécom Lille Douai, 2023. http://www.theses.fr/2023MTLD0008.
Анотація:
Le besoin en traitement des eaux usées par la société est assurée en usine d’épuration par des traitements menant à la production de boues. Afin d’anticiper l’augmentation de ce besoin à l’avenir, les filières de traitement de ces boues doivent atteindre une certaine efficacité, en termes de traitement et de valorisation des boues. Parmi ces filières, le procédé de méthanisation permet de réduire significativement le volume des boues générées et permet par la suite une valorisation agronomique et énergétique, sous forme de digestat, de biogaz, d’électricité ou de chaleur. Il est néanmoins limité par un contrôle inefficace du transport des boues digérées en son sein, du fait de la méconnaissance de la thermo-rhéologie, en termes de connaissances et de méthodes de caractérisation et en termes d’hydrodynamique en conduite de ces boues très diverses. Cela se manifeste opérationnellement, en aval de la phase de dimensionnement et de conception, lors de l’opération par des pompages inefficaces, des hétérogénéités de la matrice ou des colmatages de composants.C’est dans cette optique d’apport des éléments scientifiques, de la caractérisation thermo-rhéologique des boues digérées d’une part et de la mise en évidence de l’hydrodynamique en conduite de ces fluides d’autre part, que le travail de recherche mené dans le cadre de cette thèse s’inscrit.Premièrement, des protocoles dédiés à caractériser spécifiquement chaque comportement non-newtonien sont établis pour cela. L’application de ces protocoles, au centre de recherche Energie Environnement de l’IMT Nord Europe et sur la plateforme Caractérisation du partenaire industriel, montre que les caractéristiques thermo-rhéologiques des boues digérées sont fidèlement modélisées par un modèle d’Herschel-Bulkley non modifié. En effet, la contrainte seuil et la rhéofluidification sont significativement pré-pondérantes devant les autres caractéristiques thermo-rhéologiques de thixotropie, de visco-élasticité et de thermo-dépendance. Le phénomène physique non anticipé de glissement aux parois est observé sur ces boues digérées, menant à une hydrodynamique hétérogène de l’écoulement en conduite de faible inertie et de faible rugosité des parois.Deuxièmement, un dispositif expérimental dédié à l’étude de l’écoulement en conduite de tels fluides est mis en place en vue de déterminer leurs comportements hydrodynamiques. Il permet de démontrer, à l’aide de fluides de travail (solution s de Carbopol), que ces fluides suivent une transition rhéo-inertielles (RIT) vers la turbulence. Cette transition se distingue par l’existence d’un régime de pré-transition, inexistant pour un fluide newtonien, au sein duquel l’écoulement présente une asymétrie, qui est observée par visualisation directe. Ces visualisations, couplées à la mesure des pertes de charges, permettent de quantifier l’intermittence de la RIT à partir des structures turbulents visualisées. Cela permet de contrôler le mouvement de tels fluides par la connaissance de la stabilisation de leurs écoulements et de l’augmentation du temps de séjour des structures turbulentes, du fait des caractéristiques non-newtoniennes (sans visco-élasticité).Ainsi, ce manuscrit synthétise les éléments scientifiques développés dans le cadre de cette thèse pour répondre aux problématiques opérationnelles rencontrées. Les verrous découlant du mande de connaissances fondamentales de la thermo-rhéologie et de l’hydrodynamique des boues qui y circule, l’étude axe sa recherche sur ces deux domaines pour apporter les fondamentaux qui pourront permettre l’amélioration de la maîtrise du transport des boues au sein du procédé de méthanisation en usine d’épurationThe society’s wastewater treatment needs are met by waste water treatment plants that produce sludges. In order to anticipate the increase in this requirement in the future, the sludge treatment processes must achieve a certain level of efficiency in terms of sludge treatment and recovery. The anaerobic digestion process significantly reduces the volume of sludge generated and can the be used for agricultural and energy purposes, in the form of digestate, biogas, electricity or heat. It is nevertheless limited by ineffective control of the transport of digested sludge within it, due to a lack of knowledge of thermo-rheology, in terms of understanding and characterisation methods, and of the hydrodynamics involved in handling these very diverse sludges. This manifests itself operationally, downstream of the sizing and design phase, in inefficient pumping, matrix heterogeneity or component clogging.It is in this context of providing scientific elements, on the one hand of the therm-rheological characerisation of digested sludge and on the other hand of the demonstration of the hydrodynamics of these fluids in operation, that the research work carried out within the framework of this thesis falls within the scope of.Firstly, protocols dedicated to the specific characterisation of each non-Newtonian behaviour have been established. The application of these protocols, at the ITM Nord Europe – Energy Environment research centre and on the industrial partner’s Characterisation plateform, shows that the thermo-rheological characteristics of digested sludge are accurately modelled by a non-modified Herschel-Bulkley model. Yield stress and shear-thinning are significantly more important than the other thermo-rheological characteristics of thixotropy, viscoelasticity and thermo-dependence. The unanticipated physical phenomon of wall slip is observed in these digested sludges, leading to heterogeneous flow hydrodynamics under conditions of low inertia and loaw wall roughness.Secondly, an experimental set-up dedicated to studying the flow of such fluids in pipe is being set up, with a visualisation to determining their hydrodynamic behaviour. Using working fluids (Carbopol solutions), it was demonstrated that these fluids undergo a rheo-inertial transition (RIT) towards turbulence. This transition is characterised by the existence of a pre-transition regime, non-existent for a Newtonian fluid, within which the flow exibits an asymmetry, which is observed by direct visualisation. These visualisations, coupled with the measurement of pressure drops, also make it possible to quantify the intermittency of the RIT on the basis of the turbulent structures visualised. This makes it possible to control the movement of such fluids through knowledge of the stabilisation of their flows and the increase in the residence time of turbulent structures, due to the non-Newtonian characteristics without viscoelasticity.Thus, this thesis manuscipt summarises the scientific elements developed within the framework of this thesis to respond to the problems of the operational obstacles encountered. As these problems stem from a lack of fundamental knowledge of the thermo-rheology and hydrodynamics of the sludge that flows through it, the study focuses its research on these two areas in order to provide the fundamentals that will make it possible to improve the control of sludge transport within the anaerobic digestion process in wastewater treatment plants
9
Guo, Dongshan. "Pipe inspection by cylindrically guided waves." Diss., The University of Arizona, 2001. http://hdl.handle.net/10150/289714.
Анотація:
In this research the cylindrically guided wave inspection technique is proposed for detecting the anomalies in a pipe. Efficient inspection of pipelines for internal and external damages is a challenging task in the chemical and power industries where long pipelines are used and the pipes are coated by insulating materials. Under traditional methods insulation coatings are removed at selected places, then the pipe wall thickness at these spots is measured by ultrasonic transducers. This is a time-consuming and expensive operation since the operation requires point-to-point examination. Guided wave ultrasonics, proposed in this research, is a much more efficient technique because by this technique long pipes can be inspected by removing insulation at only limited places. Detecting anomalies inside the pipe wall at a specific depth can be realized by correctly selecting a cylindrical guided wave and propagating that mode through the pipe. A new transducer holder mechanism has been designed and fabricated for pipe inspection by cylindrical guided waves. A number of advanced coupling mechanisms developed recently for large plate and pipe inspection require the presence of a coupling fluid between the ultrasonic transducer and the pipe or plate specimen. These mechanisms can be used for inspecting horizontal pipes and plates. Commercially available ultrasonic transducers have been used to generate compressional ultrasonic waves in the coupling medium. Those waves are converted to cylindrical guided waves in the pipe by the new coupling mechanism. The new coupling mechanism presented in this research uses solid material as the coupler and can be used equally well for inspecting horizontal as well as inclined or vertical pipes. The new coupling mechanism has been designed to generate efficiently different guided wave modes in the pipe. Different kinds of anomalies in pipes have been successfully inspected. The preliminary results show that a number of Lamb modes when generated properly by the new coupling mechanism are very sensitive to pipe defects. These experimental results along with the new design of the coupling mechanism are presented in this dissertation.
10
Shaul, Robert. "Wave forces on cylindrical piles and pile groups : a critical review." Master's thesis, University of Cape Town, 1990. http://hdl.handle.net/11427/8293.
Анотація:
Includes bibliography.This thesis is a critical review of methods of predicting wave forces on vertical piles or groups of piles. It assigns different force prediction theories to different situations or flow regimes and analyses their advantages and disadvantages. The thesis is split into two sections: Section I reviewing the force prediction methods for single piles, and Section II for groups of piles.
Книги з теми "Cylindrical pipe":
1
Boersma, Bendiks Jan. Elecromagnetic Effects in Cylindrical Pipe Flow. Coronet Books, 1997.
2
Escudier, Marcel. Internal laminar flow. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198719878.003.0016.
Анотація:
In this chapter it is shown that solutions to the Navier-Stokes equations can be derived for steady, fully developed flow of a constant-viscosity Newtonian fluid through a cylindrical duct. Such a flow is known as a Poiseuille flow. For a pipe of circular cross section, the term Hagen-Poiseuille flow is used. Solutions are also derived for shear-driven flow within the annular space between two concentric cylinders or in the space between two parallel plates when there is relative tangential movement between the wetted surfaces, termed Couette flows. The concepts of wetted perimeter and hydraulic diameter are introduced. It is shown how the viscometer equations result from the concentric-cylinder solutions. The pressure-driven flow of generalised Newtonian fluids is also discussed.
Частини книг з теми "Cylindrical pipe":
1
Chaudhari, Aishwarya, Mangesh Borkar, Arvind Deshpande, Mandar Tendolkar, and Vivek K. Singh. "Numerical Investigation of Cylindrical Heat Pipe Performance." In Advances in Intelligent Systems and Computing, 295–306. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-1966-2_26.
2
Jain, Dinesh Kumar, and A. V. Deshpande. "Mathematical Modelling and Optimization of Cylindrical Heat Pipe." In Fluid Mechanics and Fluid Power, Volume 5, 545–54. Singapore: Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-6074-3_50.
3
Nasir, Faiza Mohamed, Mohd Zulkifly Abdullah, and Fairosidi Idrus. "Thermal Analysis of a Cylindrical Sintered Wick Heat Pipe." In Advanced Structured Materials, 307–19. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05621-6_28.
4
Zhang, R., M. H. Evans, R. Worley, S. R. Anderson, and L. Mihaylova. "Improving SLAM in Pipe Networks by Leveraging Cylindrical Regularity." In Towards Autonomous Robotic Systems, 56–65. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-89177-0_6.
5
Xia, M., H. Takayanagi, and K. Kemmochi. "Stress Analysis of Lateral Compression for a Laminated Cylindrical Pipe." In Design and Manufacturing of Composites, 311–16. New York: CRC Press, 2021. http://dx.doi.org/10.1201/9781003076131-55.
6
Xian-Li, Li. "A CAD/CAM Program of Filament Winding on a Cylindrical Pipe." In Composite Structures 5, 647–56. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-1125-3_38.
7
Vitaly, Miroshnikov. "Rotation of the Layer with the Cylindrical Pipe Around the Rigid Cylinder." In Lecture Notes in Mechanical Engineering, 314–22. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-18487-1_32.
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Ramkumar, P., C. M. Vivek, P. Latha, and S. P. Manikandan. "Experimental and Heat Transfer Analysis Using Nanofluid in Cylindrical Heat Pipe Heat Exchanger." In 2nd International Conference on Smart Sustainable Materials and Technologies (ICSSMT 2023), 65–72. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-49826-8_9.
9
Kolesnik, Marina. "On Vision-Based Orientation Method of a Robot Head in a Dark Cylindrical Pipe." In SOFSEM 2000: Theory and Practice of Informatics, 365–74. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/3-540-44411-4_25.
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Nieuwstadt, F. T. M., Bing Ma, and Zhang Zhaoshun. "Numerical Simulation of the Evolution of Non-Axisymmetric Disturbances in Cylindrical Laminar Pipe Flow." In Fluid Mechanics and Its Applications, 179–82. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5118-4_44.
Тези доповідей конференцій з теми "Cylindrical pipe":
1
Venu Madhav, H., Venkata Rauhavendra, Pramod Kumar, and Amrit Ambirajan. "Analytical Model for a Cylindrical Heat Pipe." In 2019 18th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (ITherm). IEEE, 2019. http://dx.doi.org/10.1109/itherm.2019.8757290.
2
Vaziri, A., H. Nayeb-Hashemi, and H. E. Estekanchi. "Dynamic Response of Cracked Cylindrical Shells With Internal Pressure." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-33582.
Анотація:
Sub-surface cracks in pipelines with internal pressure may severely affect their dynamic response. The extreme cases of these cracks are when these cracks go through the thickness of the pipes. Dynamic responses of cracked and un-cracked pipes with fixed ends and under various internal pressures were evaluated experimentally and theoretically. In the experimental part, the effects of pipe internal pressure on the resonant frequencies and damping of the pipe were evaluated. In the theoretical part, finite element analyses were performed to find dynamic response of pipes with various crack length and orientation respect to the axis of the pipe. The experimental results showed resonant frequencies of the pipe are little sensitive to the pipe internal pressure. Similar results were obtained from the theoretical investigations. An axial crack had little effect on the pipe resonant frequencies. In contrast, cracks oriented at an angle to the axis of the pipe had a pronounced effect on some of the resonant frequencies of the pipe. This depended on the crack location in a particular mode shapes. For frequencies where the nodal point of the mode shape was located on the crack region, the frequencies were not significantly affected by the presence of the crack in the pipe. Furthermore, it was observed that the pipe internal pressure had little effect on the resonant frequencies of the cracked pipes.
3
Wang, Z., J. M. Ochterbeck, J. Perez, and P. Rogers. "STEADY STATE OPERATION OF CYLINDRICAL LOOP HEAT PIPE EVAPORATORS." In Annals of the Assembly for International Heat Transfer Conference 13. Begell House Inc., 2006. http://dx.doi.org/10.1615/ihtc13.p12.350.
4
Chakraborty, Soumya, Gary J. Saulnier, Kyle W. Wilt, Robert B. Litman, and Henry A. Scarton. "Low-rate ultrasonic communication axially along a cylindrical pipe." In 2014 IEEE International Ultrasonics Symposium (IUS). IEEE, 2014. http://dx.doi.org/10.1109/ultsym.2014.0135.
5
Roy, Pratit Sunder Dev, Koushik Das, and Hriday Mani Kalita. "Performance Enhancement of Cylindrical Heat Pipe using Tapered Wick." In Proceedings of the 27th National and 5th International ISHMT-ASTFE Heat and Mass Transfer Conference December 14-17, 2023, IIT Patna, Patna-801106, Bihar, India. Connecticut: Begellhouse, 2024. http://dx.doi.org/10.1615/ihmtc-2023.460.
6
Geng, J., and K. Thomas. "Reflection of Blast Waves Off Cylindrical Pipes." In ASME 2007 Pressure Vessels and Piping Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/pvp2007-26692.
Анотація:
In this paper, the interaction between a blast wave and an array of cylindrical objects (pipe or vessel) has been numerically investigated to evaluate blast load distribution around the objects. It was found that the interaction leads to a blast focusing within the gap between two adjacent pipes, and that the focused overpressure may exceed a fully reflected overpressure. This paper examines the effects of a combination of the arrangement of pipes (diameter, gap distance) and incident blast wave characteristic parameters (positive phase duration) on the focusing phenomena and the resultant blast load distribution.
7
Sudheer, S., and S. V. Prabhu. "Thermal Interaction Between a Circular Pipe and Diesel Pool Fire." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-88714.
Анотація:
Characterization of pool fires in the presence of cylindrical containers is highly relevant for various applications. A cylindrical container is idealized as a circular pipe packed with insulating material inside. Open pool fire experiments are conducted with a cylindrical container located at the center. The pool fire diameters considered were 0.5 m, 0.7 m and 1.0 m with diesel as the fuel. The cylindrical containers are made of stainless steel 304L. The outer diameters of the pipes are 114 mm, 168 mm and of thickness 8.6 mm, 7.1 mm respectively. The effect of blockage ratio on the mass burning rate for vertical and horizontal orientations of 168 mm cylindrical container is studied. It is observed that there is no significant change in mass burning rate due to the blockage effect. Temperatures are measured at various locations inside the pipes and at the center of the insulation. It is observed that the temperatures along a plane perpendicular to the axis are uniform when the pipes are vertically oriented. IHCP 1D code is applied to estimate the incident heat flux on to the bodies when immersed in open pool fires with different orientations.
8
Chen, Shuaishuai, and Weicong Shen. "Design of cylindrical pipe automatic welding control system based on STM32." In ADVANCES IN MATERIALS, MACHINERY, ELECTRONICS II: Proceedings of the 2nd International Conference on Advances in Materials, Machinery, Electronics (AMME 2018). Author(s), 2018. http://dx.doi.org/10.1063/1.5033774.
9
Famouri, Mehdi, M. Mahdi Abdollahzadeh, Ahmed Abdulshaheed, GuangHan Huang, Gerardo Carbajal, and Chen Li. "Transient Analysis of a Cylindrical Heat Pipe Considering Different Wick Structures." In ASME 2016 Heat Transfer Summer Conference collocated with the ASME 2016 Fluids Engineering Division Summer Meeting and the ASME 2016 14th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/ht2016-7469.
Анотація:
Heat pipes have been shown to be one of the most efficient passive cooling devices for electronic cooling. Only a handful of studies were capable of solving transient performances of heat pipes based on realistic assumptions. A segregated finite volume base scheme using SIMPLE algorithm is used along with system pressurization and overall mass balance to solve mass transfer at the interface, continuity, momentum and energy equations. The fluid flow and heat transfer are solved throughout the wick and vapor core and no assumptions are made at the locations where evaporation and condensations occur. Water is the working fluid and variable densities are used for both liquid and vapor phases to account for continuity at the interface as well as inside of wick and vapor core. The wick is modeled as a non-homogeneous porous media and the effective thermal conductivities and viscous properties are calculated for each type of structure separately using the available relations from the literature. In this study, an axisymmetric two-dimensional solver for cylindrical heat pipe is developed using FLUENT package with the help of User Defined Functions (UDFs) and User Defined Scalar (UDS). The model is tested for grid and time step independency and the results show the stability and accuracy of the proposed method. The numerical results of the present study were in good agreement with the data from previous numerical and experimental studies available in the literature. Additionally, two different wick structures were studied to determine its effect on the thermal performance of heat pipes.
10
Fukunaga, Fumika, and Jun-ya Nagase. "Cylindrical elastic crawler mechanism for pipe inspection inspired by amoeba locomotion." In 2016 6th IEEE International Conference on Biomedical Robotics and Biomechatronics (BioRob). IEEE, 2016. http://dx.doi.org/10.1109/biorob.2016.7523664.
Звіти організацій з теми "Cylindrical pipe":
1
Sullivan, E. J., and J. V. Candy. Acoustic Propagation in a Water-Filled Cylindrical Pipe. Office of Scientific and Technical Information (OSTI), June 2003. http://dx.doi.org/10.2172/15004932.
2
Yoosef-Ghodsi, Ozkan, and Bandstra. PR-244-114501-R01 Review of Compressive Strain Capacity Assessment Methods Final Report. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), October 2013. http://dx.doi.org/10.55274/r0010402.
Анотація:
Buried pipelines subjected to non-continuous ground movement such as frost heave, thaw settlement, slope instability and seismic movement experience high compressive strains that can cause local buckling (or wrinkling), in which the pipe wall buckles like a thin cylindrical shell in axial compression. In a strain-based design and assessment framework, excessive local buckling deformation that may cause loss of serviceability, or even pressure containment in some cases, is managed by limiting the strain demand below the strain limit. The determination of compressive strain limit is typically performed by full-scale structural testing or nonlinear finite element analysis that takes into account material and geometric non-linearity associated with the inelastic buckling of cylindrical shells. Before performing testing and numerical analysis (or when such options do not exist), empirical equations are used to estimate the strain limit. In this report a number of representative equations were evaluated by comparing strain limit predictions to full-scale test results. Work prior to this study has identified the importance of key variables that have the greatest impact on the local buckling behaviour. Examples of these variables include the diameter-to-thickness (D/t) ratio, internal pressure and shape of the stress strain curve. The evaluation focused on how existing equations address these key variables, and the performance with respect to key variables and in different ranges.
3
Singh, Niranjan. A Method of Sound Wave Diffusion in Motor Vehicle Exhaust Systems. Unitec ePress, April 2017. http://dx.doi.org/10.34074/ocds.072.
Анотація:
It is common practice among young vehicle owners to modify the exhaust system of their vehicle to reduce exhaust backpressure with the perception that the output power increases. In the process of backpressure reduction, the output noise (Whakapau) of the vehicle also increases correspondingly. The conflict of interest that arises from modified vehicle exhaust systems and the general public is well publicised. This prototype was designed to meet the demands of exhaust back pressure reduction while at the same time mitigate the sound output of the vehicle. The design involves lining a cylindrical pipe with common glass marbles which is normally used for playing. The marbles are made of a sustainable material as it does not erode when exposed to exhaust gases and it is easily recycled. The prototype muffler is much smaller in size when compared to conventional mufflers. All tests were done in a simulated controlled environment and data collated using approved New Zealand Transport Agency testing regime. It has to be noted that the test focus was noise mitigation and not comprehensive engine performance testing. The results of the test prove a reduction of sound levels, however more testing needs to be undertaken with varying annulus depth, marble sizes and arrangements and engine loads.
4
Puglisi, M. INTRODUCTION TO FIELDS IN HOLLOW CYLINDRICAL PIPES AND CAVITY RESONATORS FOR RFQ (Part-1). Office of Scientific and Technical Information (OSTI), August 1985. http://dx.doi.org/10.2172/1151137.
5
Boyle, M. Terrestrial vegetation monitoring at Congaree National Park: 2021 data summar. National Park Service, August 2023. http://dx.doi.org/10.36967/2300302.
Анотація:
he Southeast Coast Network (SECN) conducts long-term terrestrial vegetation monitoring as part of the NPS Inventory and Monitoring Program. The vegetation community vital sign is one of the primary-tier resources identified by SECN park managers, and monitoring is conducted at 15 network parks (DeVivo et al. 2008). Monitoring plants and their associated communities over time allows for targeted understanding of ecosystems within the SECN geography, which provides managers information about the degree of change within their parks’ natural vegetation. 2021 marked the first year of conducting this monitoring effort at Congaree National Park (CONG). Sixty-four vegetation plots were established throughout the park from May through August. Data collected in each plot included species richness across multiple spatial scales, species-specific cover and constancy, species-specific woody stem seedling/sapling counts and adult tree (greater than 10 centimeters [3.9 inches {in}]) diameter at breast height (DBH), overall tree health, landform, soil, observed disturbance, and woody biomass (i.e., fuel load) estimates. This report summarizes the baseline (year 1) terrestrial vegetation data collected at Congaree National Park in 2021. Data were stratified across two dominant broadly defined habitats within the park, Coastal Plain Upland Open Woodlands and Coastal Plain Alluvial Wetlands. Noteworthy findings include: 295 vascular plant taxa (species or lower) were observed across 64 vegetation plots, including 37 species not previously documented within the park. 27 unique species of sedge (Carex sp.) were found across all plots. The most frequently encountered species in each broadly defined habitat included: Coastal Plain Alluvial Wetlands: green ash (Fraxinus pennsylvanica), red maple (Acer rubrum), possumhaw (Ilex decidua), eastern poison ivy (Toxicodendron radicans var. radicans), muscadine (Muscadinia rotundifolia var. rotundifolia) and smallspike false nettle (Boehmeria cylindrica). Coastal Plain Upland Open Woodlands: loblolly pine (Pinus taeda), muscadine, sweetgum (Liquidambar styraciflua), willow oak (Quercus phellos), roundleaf greenbrier (Smilax rotundifolia), and Carolina jessamine (Gelsemium sempervirens). Seven non-native species categorized as invasive (Significant or Severe Threat) by the South Carolina Exotic Pest Plant Council (SCEPPC 2014) were encountered within the park during this monitoring effort. These included sweet autumn virginsbower (Clematis terniflora), Chinese privet (Ligustrum sinense), Japanese honeysuckle (Lonicera japonica), Japanese climbing fern (Lygodium japonicum), Japanese stilt grass (Microstegium vimineum), marsh dew flower (Murdannia keisak), and Chinese wisteria (Wisteria sinensis). Four species listed as rare and tracked by the South Carolina Natural Heritage Program (SCNHP 2023) were encountered during this monitoring effort. These included Cherokee sedge (Carex cherokeensis), ravenfoot sedge (Carex crus-corvi), Santee azalea (Rhododendron eastmanii), and heartleaf nettle (Urtica chamaedryoides). Sweetgum, water tupelo (Nyssa aquatica), green ash, and bald-cypress were the most dominant species within the tree stratum of Coastal Plain Alluvial Wetland sites; loblolly pine was the most dominant species of Coastal Plain Upland Open Woodlands. Feral hog (Sus scrofa) rooting was observed in 73% of the Coastal Plain Alluvial Wetland plots, while 20% of the plots had over 60% damage from rooting behavior. Hog activity was observed throughout the Congaree National Park’s floodplain, but largely absent from sites along the park’s northern boundary with the private hunt club. Based on data collected from eight Coastal Plain Upland Open Woodland plots, the canopy and subcanopy composition and structure of the park’s upland pine woodlands are not in a condition to maintain fire-dependency and thus promote healthy and sustainable longleaf pine woodlands. Densities of loblolly pine in the canopy and sweetgum in the sapling stratum are elevated. However, with continued fire and fire surrogate treatments to these upland units, thriving longleaf pine woodlands can be achieved. All plots are scheduled to be resampled during the summer of 2025.
6
Boyle, M. Terrestrial vegetation monitoring at Ocmulgee Mounds National Historical Park: 2021 data summary. National Park Service, July 2023. http://dx.doi.org/10.36967/2299748.
Анотація:
The Southeast Coast Network (SECN) conducts long-term terrestrial vegetation monitoring as part of the NPS Inventory and Monitoring Program. The vegetation community vital sign is one of the primary-tier resources identified by SECN park managers, and monitoring is conducted at 15 network parks (DeVivo et al. 2008). Monitoring plants and their associated communities over time allows for targeted understanding of ecosystems within the SECN geography, which provides managers information about the degree of change within their parks’ natural vegetation. 2021 marks the first year of conducting this monitoring effort at Ocmulgee Mounds National Historical Park (OCMU). Eight vegetation plots were established throughout the park in early May. Data collected in each plot included species richness across multiple spatial scales, species-specific cover and constancy, species-specific woody stem seedling/sapling counts and adult tree (greater than 10 centimeters [3.9 inches {in}]) diameter at breast height (DBH), overall tree health, landform, soil, observed disturbance, and woody biomass (i.e., fuel load) estimates. This report summarizes the baseline (year 1) terrestrial vegetation data collected at Ocmulgee Mounds National Historical Park in 2021. Data were stratified across two dominant broadly defined habitats within the park, Coastal Plain Alluvial Wetlands and Coastal Plain Upland Forests. Noteworthy findings include: 142 vascular plant taxa (species or lower) were observed across eight vegetation plots, including 15 species not previously documented within the park. The most frequently encountered species in each broadly defined habitat included: Coastal Plain Alluvial Wetlands: Chinese privet (Ligustrum sinense), Chinese tallow (Triadica sebifera), Japanese honeysuckle (Lonicera japonica), eastern poison ivy (Toxicodendron radicans var. radicans), and smallspike false nettle (Boehmeria cylindrica). Coastal Plain Upland Forests: sweetgum (Liquidambar styraciflua), muscadine (Muscadinia rotundifolia var. rotundifolia), winged elm (Ulmus alata), water oak (Quercus nigra), loblolly pine (Pinus taeda), yaupon (Ilex vomitoria), Japanese honeysuckle, American beautyberry (Callicarpa americana), ebony spleenwort (Asplenium platyneuron), and multiple species of woody vines. Eleven non-native species invasive (Category 1 or Category 2) by the Georgia Exotic Pest Plant Council (GA-EPPC 2023) were encountered within the park during this monitoring effort. Three of these species—Chinese privet, Chinese tallow, and Japanese honeysuckle—were among the most frequent and abundant of all species observed within Coastal Plain Alluvial Wetland plots. There were no observations of vascular plant species listed as rare and tracked by the Georgia Department of Natural Resources (GADNR 2023) within these monitoring plots. Sweetgum, red maple (Acer rubrum), swamp tupelo (Nyssa biflora), and Chinese tallow were the most dominant species within the tree stratum of Coastal Plain Alluvial Wetland sites; water oak, loblolly pine, and sweetgum were the most dominant species of Coastal Plain Upland Forests. There were very few observable disturbances to natural and semi-natural vegetation communities documented during this monitoring effort, including very little to no impact of browsing by white-tailed deer, rooting by feral hogs, or presence of diseased or dying trees. The two most pronounced threats to native vegetation on the park are (1) the high prevalence of non-native, invasive plant species (particular within alluvial habitat, and (2) the altered hydrology of the park’s alluvial wetlands from conversion of large berms for vehicle and railroad traffic. Long-term monitoring data will aid in understanding how these threats over time impact the park’s forest communities.
7
Boyle, Maxwell. Terrestrial vegetation monitoring at Canaveral National Seashore: 2022 data summary. National Park Service, 2024. http://dx.doi.org/10.36967/2303291.
Анотація:
The Southeast Coast Network (SECN) conducts long-term terrestrial vegetation monitoring as part of the NPS Inventory and Monitoring Program. The vegetation community vital sign is one of the primary-tier resources identified by SECN park managers, and monitoring is conducted at 15 network parks (DeVivo et al. 2008). Monitoring plants and their associated communities over time allows for targeted understanding of ecosystems within the SECN geography, which provides managers information about the degree of change within their parks? natural vegetation. 2022 marked the first year of conducting this monitoring effort at Canaveral National Seashore (CANA). Fourteen vegetation plots were established throughout the park in April. Data collected in each plot included species richness across multiple spatial scales, species-specific cover and constancy, species-specific woody stem seedling/sapling counts and adult tree (greater than 10 centimeters [3.9 inches {in}]) diameter at breast height (DBH), overall tree health, landform, soil, observed disturbance, and woody biomass (i.e., fuel load) estimates. This report summarizes the baseline (year 1) terrestrial vegetation data collected at Canaveral National Seashore in 2022. Data were stratified across two dominant broadly defined habitats within the park, Coastal Plain Upland Open Woodlands and Maritime Upland Forests and Shrublands. Noteworthy findings include: 176 vascular plant taxa were observed across 14 vegetation plots, including seven species not previously documented within the park. The most frequently encountered species in each broadly defined habitat included: Coastal Plain Upland Open Woodlands: saw palmetto (Serenoa repens), dune greenbrier (Smilax auriculata), Elliott?s milkpea (Galactia elliottii), myrtle oak (Quercus myrtifolia), Chapman oak (Quercus chapmanii), and southern evergreen blueberry (Vaccinium myrsinites). Maritime Upland Forests and Shrublands: live oak (Quercus virginiana), muscadine (Muscadinia rotundifolia var. rotundifolia), saw palmetto, cabbage palmetto (Sabal palmetto), dune greenbrier, and Virginia creeper (Parthenocissus quinquefolia). Four non-native species categorized as invasive by the Florida Invasive Species Council (FISC 2019) were encountered within Maritime Upland Forest and Shrubland plots during this monitoring effort. These included Brazilian peppertree (Schinus terebinthifolia), cogongrass (Imperata cylindrica), common lantana (Lantana strigocamara), and caesarweed (Urena lobata). There were no invasive species observed in Coastal Plain Upland Open Woodland plots. Two species listed as Endangered by the state of Florida (FDACS 2021) were encountered on the park during this monitoring effort and included hand fern (Cheiroglossa palmata) and Atlantic Coast Florida lantana (Lantana depressa var. floridana). Hand fern was observed in 30%of Maritime Upland Forest and Shrubland plots, while lantana was observed in one (10%) of Maritime Upland Forest and Shrubland plots. An additional five vascular species categorized as Commercially Exploited by the state of Florida (FDACS 2021) were also observed in these vegetation plots. Slash pine (Pinus elliottii) or South Florida slash pine (Pinus densa) and sand live oak (Quercus geminata) were the most dominant species within the tree stratum of Coastal Plain Upland Open Woodlands within the park; cabbage palmetto and live oak were the most dominant species of Maritime Upland Forests and Shrublands, although 11 other species large enough to be measured as trees (i.e., more than 1.37 meters (4.5 ft) in height and greater than or equal to 10 centimeters (3.9 in) in diameter at breast height (DBH) were also present within these plots. Based on these baseline findings, the most immediate threat to vegetation resources within Upland Open Woodlands of Canaveral National Seashore is related to exclusion of fire and an altered natural fire regime. These factors have likely led to a reduction of canopy species (pines) across all woody stem strata?tree, sapling, seedling?and an increase in abundance of woody shrub species (e.g., saw palmetto). These characteristics (low canopy species density and high woody shrub abundance) were observed in monitoring plots of this habitat type. The most immediate threat to Maritime Upland Forest and Shrubland habitat within the park is from potential expansion of non-native, invasive plant species, like Brazilian peppertree and cogongrass. All plots are scheduled to be resampled during the summer of 2026.
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Boyle, M. Terrestrial vegetation monitoring at Chattahoochee River National Recreation Area: 2021 data summary. National Park Service, 2024. http://dx.doi.org/10.36967/2303257.
Анотація:
The Southeast Coast Network (SECN) conducts long-term terrestrial vegetation monitoring as part of the NPS Inventory and Monitoring Program. The vegetation community vital sign is one of the primary-tier resources identi?ed by SECN park managers, and monitoring is conducted at 15 network parks (DeVivo et al. 2008). Monitoring plants and their associated communities over time allows for targeted understanding of ecosystems within the SECN geography, which provides managers information about the degree of change within their parks? natural vegetation. 2021 marked the ?rst year of conducting this monitoring e?ort at Chattahoochee River National Recreation Area (CHAT). Thirty vegetation plots were established throughout the park from June through July. Data collected in each plot included species richness across multiple spatial scales, species-speci?c cover and constancy, species-speci?c woody stem seedling/sapling counts and adult tree (greater than 10 centimeters [3.9 inches {in}]) diameter at breast height (DBH), overall tree health, landform, soil, observed disturbance, and woody biomass (i.e., fuel load) estimates. This report summarizes the baseline (year 1) terrestrial vegetation data collected at Chattahoochee River National Recreation Area in 2021. Data were strati?ed across two dominant broadly de?ned habitats within the park, including Piedmont Upland Forests and Piedmont Alluvial Wetland Vegetation and three land parcels: North?from Bowman?s Island to Abbotts Bridge, Middle?from Medlock Bridge to Gold Branch, and South?from Sope Creek to Palisades. Noteworthy ?ndings include: 299 vascular plant taxa were observed across 30 vegetation plots, including 29 species not previously documented within the park. The most frequently encountered species in each broadly de?ned habitat included: Piedmont Alluvial Wetland Vegetation: Chinese privet (Ligustrum sinense), sweetgum (Liquidambar styraciflua), eastern poison ivy (Toxicodendron radicans var. radicans), muscadine (Muscadinia rotundifolia var. rotundifolia), and smallspike false nettle (Boehmeria cylindrica). Piedmont Upland Forests: tuliptree (Liriodendron tulipifera var. tulipifera), eastern poison ivy, Virginia creeper (Parthenocissus quinquefolia), cat greenbrier (Smilax glauca), muscadine, mockernut hickory (Carya tomentosa), and black edge sedge (Carex nigromarginta). Sixteen non-native species categorized as invasive by the Georgia Exotic Pest Plant Council (GA-EPPC 2023) were encountered during this monitoring e?ort, including two not previously detected within the park?miniature beefsteak plant (Mosla dianthera) and Chinese holly (Ilex cornuta). Chinese privet and Japanese honeysuckle (Lonicera japonica) were the most frequently encountered and abundant invasive plant within the park. One species of special concern listed for Georgia (GADNR 2024) was observed during this monitoring e?ort?large-fruited sanicle (Sanicula trifoliata). Tuliptree, loblolly pine (Pinus taeda), boxelder (Acer negundo var. negundo), river birch (Betula nigra), and sweetgum were the most dominant species within the tree stratum of Piedmont Alluvial Wetlands of Chattahoochee River National Recreation Area; white oak (Quercus alba), loblolly pine, tuliptree, and mockernut hickory were the most dominant species of Piedmont Upland Forests. Chinese privet was the most abundant species within the sapling and seedling strata of Piedmont Alluvial Wetlands. The mortality rate of green ash (Fraxinus pennsylvanica) within Piedmont Alluvial Wetland plots was high, and it is likely these trees succumbed to impacts from emerald ash borer (Agrilus planipennis). The emerald ash borer is a wood-boring pest of ash (Fraxinus sp.) and is native to Asia. Since its discovery in the U. S. in the early 2000s, the insect has been responsible for the death of tens of millions of ash trees in the eastern and midwestern parts of the country. At this time, it is not certain whether the declining health of ash within Chattahoochee River National Recreation Area is due to emerald ash borer, edaphic factors that are responsible for natural mortality and decline, or other factors. Other threats to native vegetation within the park are: (1) the high prevalence of non-native, invasive plant species; (2) ?re suppression within oak-hickory; and (3) impacts from heavy browse by white-tailed deer (Odocoileus virginianus). All plots monitored during this sampling e?ort are scheduled to be resampled in 2024.